According to Drucker, writing in the Harvard Business Review (June 2004), the best CEOs he encountered in the 65 years of his work were "all over the map in terms of their personalities, attitudes, values, strengths and weaknesses". They were, however, remarkably similar in their behaviours.
The key to effectiveness lies in Eight Elements of Effectiveness
The winning CEOs...--asked "what needs to be done?"
--asked "what is right for the enterprise?"
--developed action plans
--took responsibility for decisions
--took responsibility for communicating
--focused on opportunities rather than problems
--ran productive meetings
--thought and said "we" rather than "I"